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3 years ago

The following random sample from a population whose values were normally

Mathematics

1 answer:

vodomira [7]3 years ago

6 0

Answer:

f urself

Step-by-step explanation:

hahahhaa

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Express in scientific notation. 0.041

lubasha [3.4K]

Answer:

4.1 x 10^-2

Step-by-step explanation:

7 0

3 years ago

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The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the

Darya [45]

Answer:

Brand 1 Brand 2 Difference

37734 35202 2532

45299 41635 3664

36240 35500 740

32100 31950 150

37210 38015 −805

48360 47800 560

38200 37810 390

33500 33215 285

Sum of difference = 2532+ 3664+740+150 −805+ 560 +390 +285 = 7516

Mean = $d=\frac{7516}{8}$

Mean = $d=939.5$

a) d= 939.5

$\text{Sample Standard deviation, s} = \sqrt{\dfrac{(x-\bar{x})^2}{n-1}}$

$=\sqrt{\dfrac{(2532-939.5)^2+(3664-939.5)^2+(740-939.5)^2 ...+(285-939.5)^2}{8-1}}$

=1441.21

b)SD= 1441.21

c)Calculate a 99% two-sided confidence interval on the difference in mean life.

confidence level =99%

significance level =α= 0.01

Degree of freedom = n-1 = 8-1 =7

So, $t_{\frac{\alpha}{2}}=3.499$

Formula for confidence interval $= \left( \bar{X} \pm t_{\frac{\alpha}{2}} \times \frac{s}{\sqrt{n}} \right)$

Substitute the values

confidence interval $= 939.5 \pm 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

confidence interval $= 939.5 - 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$ to $= 939.5 + 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

Confidence interval $−843.396\$ to $2722.396$

8 0

3 years ago

A triangle has side lengths of x, x+11, and 3x+5. What is the perimeter?

Tomtit [17]

Answer:

5x + 16

Step-by-step explanation:

7 0

3 years ago

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What is the simplified form of the expression?

sineoko [7]

The answer is: 10 x¹³ y¹⁰ .
__________________________________________________________

1x^8 * 2y^(10) * 5x^5 =

1* 2* 5 * x^8 * x^5 * y^(10) =

10 * x^(8+5) * y^(10) =

10 * x^(13) * y^(10) = 10 x^(13) y^10 ; write as:
_______________________________________________
10 x¹³ y¹⁰ .
______________________________________________________

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3 years ago

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Bananas cost $0.54 per lb and grapes cost$1.28 per lb. Leanne bought 2.6 lb of bananas and 3.1 lb of grapes .How much did she pa

slamgirl [31]

So all u have to do is just add $1.28 and $0.54

5 0

4 years ago